Commit-ID: ce5f7f8200ca2504f6f290044393d73ca314965a Gitweb: http://git.kernel.org/tip/ce5f7f8200ca2504f6f290044393d73ca314965a Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Mon, 12 May 2014 22:50:34 +0200 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Thu, 22 May 2014 10:21:26 +0200 sched/deadline: Change sched_getparam() behaviour vs SCHED_DEADLINE The way we read POSIX one should only call sched_getparam() when sched_getscheduler() returns either SCHED_FIFO or SCHED_RR. Given that we currently return sched_param::sched_priority=0 for all others, extend the same behaviour to SCHED_DEADLINE. Requested-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx> Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Acked-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx> Cc: Dario Faggioli <raistlin@xxxxxxxx> Cc: linux-man <linux-man@xxxxxxxxxxxxxxx> Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/20140512205034.GH13467@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/core.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index cdefcf7..f3f08bf 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3713,7 +3713,7 @@ SYSCALL_DEFINE1(sched_getscheduler, pid_t, pid) */ SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param) { - struct sched_param lp; + struct sched_param lp = { .sched_priority = 0 }; struct task_struct *p; int retval; @@ -3730,11 +3730,8 @@ SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param) if (retval) goto out_unlock; - if (task_has_dl_policy(p)) { - retval = -EINVAL; - goto out_unlock; - } - lp.sched_priority = p->rt_priority; + if (task_has_rt_policy(p)) + lp.sched_priority = p->rt_priority; rcu_read_unlock(); /* -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
